Robot vacuum cleaner



FIG. 1 is a perspective view of a robot vacuum cleaner showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a first side view thereof;

FIG. 5 is a second side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Elements shown in broken lines are included for the purpose of showing environment and form no part of the claimed design. 

CLAIM I claim the ornamental design for a robot vacuum cleaner, as shown and described. 